Ernst jtjbges



Nov. 2 1926,.

E. JURGES FunNAcE med Nov'. s. 192s Patented Nov. 2, 1926.

UNITED sTATEsPATENT OFFICE.

ERNST JRGES, 0F HAGEN, GERMANY.

FURNACE.

Application led November 3, v1925, Serial No. 66,634, and in Germany .Tune 21, 1924.

In power plants such as electrical generating stations and the like, exceptionally high demands for power frequently` occur and, in some instances, Irecur at regular intervals, 5 and in order to meet such demands yit has been proposed to increase the boiler capacity by providing the ordinary furnace with means for admitting supplementary fuelvin the form of an oil or coal dust furnace which l .is only set going during the time of excessive demands for power, that is, for dealing with peak loads. Since in such instances it is not so much the temperature in the furnace chamber as the quantity of furnace l gases which is raised, the furnace chamber according to the present invention is enlarged during theworking of the supplementary fuel supplying means. Adjustable furnace arches which admit of being adjust- 2 ed to various heights and inclinations above the layer. of fuel are, in themselves, already known. The present invention employs these adjustable furnace arches, on the one hand for increasing the size of the furnace chamber `which must be loccupied by the furnace gases generated by the additional fuel and, on the other hand, for uncovering the supplementary fuel` supplying means when raised and covering it again when lowered. By this means the result is obtained that the supplementary fuel supplying means is protected against the action of the grate furnace when not in operation.

The accompanying drawingV illustrates apparatus according to the present invention in longitudinal section.v

. In this drawing a is the grate and b is a supplementary fuel supplying device of anyl nozzle or spraying type.

A furnace arch c, which in the present instance consists of arch stones vsuspended singly Aor inseries, is carried by a frame d, which, in its turn, can be adjusted in a Vertical direction in a stationary frame e in any convenient VV manner, as for example by means of the gearing indicated in the drawing. The drawing shows the position `in which the supplementary fuel Isupplying means is in operation for the purpose of dealing with occasional peak loads. .When the supplementar-y fuel Vsupplying means is thrown out of operation the arch is lowered in the manner indicated, in. which case it moves downwards parallel to itself and thereby shutsA off or covers vup the supplementary fuel supplying means so that the latter is withdrawn from the iniuence of the grate furnace.

-A furnace comprising in combination a furnace chamber, means for supporting primary fuel in said furnace chamber, means for supplying supplementary fuel to said furnace chamber, a furnace arch for form,- ing the top of said chamber, said vfurnace arch being adapted to cover said supplementary fuel supplying means Ifor enabling the furnace to be operated with primary fuel alone and of being raised for uncovering said supplementary fuel supplying means and increasingthe size of thefurnace A `chamber when said supplementary fuel supplying means is in operation, and means for raising and lowering said furnace arch for the purpose set forth.` 75

In testimony whereof I have signed my naine to this specification.

ERNST JRGES. 

